Issue(#88): Bug fix in function PrepareFrame where repeated MAC commands were not handled correctly.
Issue(#88): Bug fix in function PrepareFrame where repeated MAC commands were not handled correctly.

abouillot/LoRaMac-node,imec-idlab/LoRaMac-node,abouillot/LoRaMac-node,reixd/LoRaMac-node,imec-idlab/LoRaMac-node,reixd/LoRaMac-node